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2006 GMC Sierra 1500 Questions

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Turns over can hear fuel pump and relay have no fire at plug changed tranny out drove it about 20 miles everything was fine parked it used headlights to clean up ran battery down charged battery now it has no fire at plugs
Now truck will not start and run
It is making this roaring noise mostly when slowing down and driving at the speed of 40 mph
The passenger side works ok.
Checked plug with power probe no power at passenger low beam plug . Relay seams to be working I get power to the high beam plug when the high beams are turned on but nothing when there off
oil leaking from oil filter, oil filter is on snug, its a 2'' puddle of oil after a drive out. no oil beyond the oil filter. could oil pressure switch be bad? if its the main seal, where else would see oil?
My purge valve keeps getting stuck open! A new one lasts a couple of weeks and then it gets stuck open too! I've been through 5 in the last few months! What could be the problem?
Not consistent
When the vehicle is jacked up and I rock the rear wheels back and forth forcefully, I hear a clunk. It sounds like there is play between the axle and the crown gear.... or something!
The parts store sold me 75 90 weight oil but no additives. Im told I need 80 90 and the additives. Is this so
With the A/C on driving along, occasionally, the heat starts blowing out the driver side vents. Turning engine off and back on again resets the door. Maybe related: just replaced the fan relay connector so the fan would work again. Black wire (out of the seven in the connector) was overheated. This heat/A/C thing was happening before the fan quit though so its probably not related to the connector.
I can turn off truck and restart engine after a half minute and it will come on for a few minutes again then it goes out again. Works fine at night (dark time) but daytime I have this problem. Have relaced blend door actuator. Codes: PO466,P0455,P0300 Bought new gas cap, plugs and wires. Haven't reset check engine light yet. But light did go out for about a week then came back on. Anyone have an idea?
I can turn off truck and restart engine after a half minute and it will come on for a few minutes again then it goes out again. Works fine at night (dark time) but daytime I have this problem. Have relaced blend door actuator. Codes: PO466,P0455,P0300 Bought new gas cap, plugs and wires. Haven't reset check engine light yet. But light did go out for about a week then came back on. Anyone have an idea?
I can turn off truck and restart engine after a half minute and it will come on for a few minutes again then it goes out again.
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